The 50 best National Geographic pictures are all gorgeous, beautiful and iconic. And as amazing as they are, they're really just a snapshot of a greater story. Wouldn't you love to find out the behind the scenes stories on how each of those pictures happened? National Geographic's new iPad app tells you just that. Some of the shots are pure luck, others take years to develop, but all of them are unique, just like the pictures themselves. Great for anybody interested in photography, really perfect for those who love great stories. $5 [iTunes via NY Times]